CVE-2025-62907 is a Stored Cross-Site Scripting (XSS) vulnerability identified in the Custom Post Type Attachment plugin developed by aviplugins.com, affecting versions up to and including 3.4.6. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is stored persistently on the affected site. When other users or administrators view the compromised content, the malicious script executes in their browsers within the context of the vulnerable website. The CVSS v3.1 base score is 5.4, indicating a medium severity level. The vector string (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N) reveals that the attack can be performed remotely over the network with low attack complexity, requires low privileges (authenticated user), and user interaction (victim must click or visit the malicious content). The vulnerability impacts confidentiality and integrity by potentially allowing session hijacking, credential theft, or unauthorized actions performed on behalf of the victim user. Availability is not affected. No public exploits have been reported yet, but the vulnerability is published and should be considered a risk for websites using this plugin. Since the plugin is commonly used in WordPress environments to manage PDF attachments as custom post types, any WordPress site using this plugin version is at risk. The vulnerability is particularly dangerous in environments where users have elevated privileges or where sensitive data is accessible through the affected plugin's interface.

For European organizations, this vulnerability poses a risk primarily to websites and web applications using the Custom Post Type Attachment plugin in WordPress. Exploitation could lead to unauthorized access to user sessions, theft of sensitive information, or execution of unauthorized actions within the context of the affected site. This can result in data breaches, reputational damage, and potential regulatory non-compliance, especially under GDPR, if personal data is compromised. Organizations relying on web portals for customer interaction, document management, or internal collaboration that use this plugin are at heightened risk. The medium severity score reflects that while the vulnerability requires authenticated access and user interaction, the potential for cross-site scripting attacks can facilitate phishing, privilege escalation, or lateral movement within the web application. Given the widespread use of WordPress in Europe, and the popularity of PDF attachment management plugins, the threat surface is significant. Additionally, the scope includes any European entity hosting public-facing websites with this plugin, including SMEs and large enterprises. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the need for proactive mitigation.

1. Apply patches or updates from aviplugins.com as soon as they become available to address this vulnerability. 2. If patches are not yet released, consider temporarily disabling or removing the Custom Post Type Attachment plugin to eliminate exposure. 3. Implement strict input validation and output encoding on all user-supplied data related to the plugin to prevent injection of malicious scripts. 4. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 5. Limit plugin usage to trusted users and roles with minimal privileges to reduce the risk of exploitation by authenticated attackers. 6. Monitor web server and application logs for unusual activities or attempts to inject scripts via the plugin interface. 7. Educate users and administrators about the risks of clicking on suspicious links or content that could trigger XSS payloads. 8. Conduct regular security assessments and penetration testing focusing on web application vulnerabilities, including XSS. 9. Employ Web Application Firewalls (WAFs) with rules designed to detect and block XSS attack patterns targeting the plugin. 10. Maintain an inventory of WordPress plugins and versions to ensure timely updates and vulnerability management.